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Finding the Fourth Proportional to 451.49, 677.20 and 143.35

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Solution

The fourth proportional to 451.49, 677.20 and 143.35 is: 215.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.49 : 677.20 = 143.35 : x
  2. Step 2: Convert to fraction form
    451.49/677.20 = 143.35/x
  3. Step 3: Cross multiply
    451.49x = 677.20 × 143.35
  4. Step 4: Simplify right side
    451.49x = 97,076.26
  5. Step 5: Solve for x
    x = 97,076.26/451.49
  6. Step 6: Final answer
    x = 215.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.